c640d0dc96
This reverts commit fdcfb8b7c2.
> Original change's description:
> > SkTypes: extract SkTo
> >
> > Change-Id: I8de790d5013db2105ad885fa2683303d7c250b09
> > Reviewed-on: https://skia-review.googlesource.com/133620
> > Reviewed-by: Mike Klein <mtklein@google.com>
Change-Id: Ida74fbc5c21248a724a5edbf9fae18a33bcb23aa
Reviewed-on: https://skia-review.googlesource.com/134506
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
115 lines
3.2 KiB
C++
115 lines
3.2 KiB
C++
/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkAutoPixmapStorage.h"
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#include "SkColor.h"
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#include "SkHalf.h"
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#include "SkOpts.h"
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#include "SkPM4f.h"
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#include "SkPixmap.h"
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#include "SkRandom.h"
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#include "SkTo.h"
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#include "Test.h"
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#include <cmath>
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static bool eq_within_half_float(float a, float b) {
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const float kTolerance = 1.0f / (1 << (8 + 10));
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SkHalf ha = SkFloatToHalf(a);
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SkHalf hb = SkFloatToHalf(b);
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float a2 = SkHalfToFloat(ha);
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float b2 = SkHalfToFloat(hb);
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return fabsf(a2 - b2) <= kTolerance;
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}
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static bool eq_within_half_float(const SkPM4f& a, const SkPM4f& b) {
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for (int i = 0; i < 4; ++i) {
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if (!eq_within_half_float(a.fVec[i], b.fVec[i])) {
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return false;
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}
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}
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return true;
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}
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DEF_TEST(color_half_float, reporter) {
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const int w = 100;
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const int h = 100;
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SkImageInfo info = SkImageInfo::Make(w, h, kRGBA_F16_SkColorType, kPremul_SkAlphaType);
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SkAutoPixmapStorage pm;
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pm.alloc(info);
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REPORTER_ASSERT(reporter, pm.computeByteSize() == SkToSizeT(w * h * sizeof(uint64_t)));
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SkColor4f c4 { 1, 0.5f, 0.25f, 0.5f };
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pm.erase(c4);
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SkPM4f origpm4 = c4.premul();
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for (int y = 0; y < pm.height(); ++y) {
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for (int x = 0; x < pm.width(); ++x) {
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SkPM4f pm4 = SkPM4f::FromF16(pm.addrF16(x, y));
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REPORTER_ASSERT(reporter, eq_within_half_float(origpm4, pm4));
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}
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}
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}
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static bool is_denorm(uint16_t h) {
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return (h & 0x7fff) < 0x0400;
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}
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static bool is_finite(uint16_t h) {
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return (h & 0x7c00) != 0x7c00;
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}
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DEF_TEST(SkHalfToFloat_finite_ftz, r) {
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for (uint32_t h = 0; h <= 0xffff; h++) {
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if (!is_finite(h)) {
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// _finite_ftz() only works for values that can be represented as a finite half float.
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continue;
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}
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// _finite_ftz() may flush denorms to zero. 0.0f will compare == with both +0.0f and -0.0f.
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float expected = SkHalfToFloat(h),
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alternate = is_denorm(h) ? 0.0f : expected;
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float actual = SkHalfToFloat_finite_ftz(h)[0];
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REPORTER_ASSERT(r, actual == expected || actual == alternate);
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}
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}
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DEF_TEST(SkFloatToHalf_finite_ftz, r) {
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#if 0
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for (uint64_t bits = 0; bits <= 0xffffffff; bits++) {
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#else
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SkRandom rand;
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for (int i = 0; i < 1000000; i++) {
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uint32_t bits = rand.nextU();
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#endif
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float f;
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memcpy(&f, &bits, 4);
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uint16_t expected = SkFloatToHalf(f);
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if (!is_finite(expected)) {
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// _finite_ftz() only works for values that can be represented as a finite half float.
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continue;
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}
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uint16_t alternate = expected;
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if (is_denorm(expected)) {
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// _finite_ftz() may flush denorms to zero, and happens to keep the sign bit.
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alternate = std::signbit(f) ? 0x8000 : 0x0000;
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}
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uint16_t actual = SkFloatToHalf_finite_ftz(Sk4f{f})[0];
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// _finite_ftz() may truncate instead of rounding, so it may be one too small.
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REPORTER_ASSERT(r, actual == expected || actual == expected - 1 ||
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actual == alternate || actual == alternate - 1);
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}
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}
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